date.c revision 1.63 
1/* $NetBSD: date.c,v 1.63 2022/10/22 20:11:43 christos Exp $ */
2
3/*
4 * Copyright (c) 1985, 1987, 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if HAVE_NBTOOL_CONFIG_H
33#include "nbtool_config.h"
34#endif
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT(
39"@(#) Copyright (c) 1985, 1987, 1988, 1993\
40 The Regents of the University of California.  All rights reserved.");
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)date.c	8.2 (Berkeley) 4/28/95";
46#else
47__RCSID("$NetBSD: date.c,v 1.63 2022/10/22 20:11:43 christos Exp $");
48#endif
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/time.h>
53
54#include <ctype.h>
55#include <err.h>
56#include <fcntl.h>
57#include <errno.h>
58#include <locale.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <syslog.h>
63#include <time.h>
64#include <tzfile.h>
65#include <unistd.h>
66#include <util.h>
67#if !HAVE_NBTOOL_CONFIG_H
68#include <utmpx.h>
69#endif
70
71#include "extern.h"
72
73static time_t tval;
74static int aflag, jflag, rflag, nflag;
75static char *fmt;
76
77__dead static void badcanotime(const char *, const char *, size_t);
78static void setthetime(const char *);
79__dead static void usage(void);
80
81int
82main(int argc, char *argv[])
83{
84	char *buf;
85	size_t bufsiz;
86	const char *format;
87	int ch;
88	long long val;
89	struct tm *tm;
90
91	setprogname(argv[0]);
92	(void)setlocale(LC_ALL, "");
93
94	while ((ch = getopt(argc, argv, "ad:f:jnr:u")) != -1) {
95		switch (ch) {
96		case 'a':		/* adjust time slowly */
97			aflag = 1;
98			nflag = 1;
99			break;
100		case 'd':
101#ifndef HAVE_NBTOOL_CONFIG_H
102			rflag = 1;
103			tval = parsedate(optarg, NULL, NULL);
104			if (tval == -1) {
105				errx(EXIT_FAILURE,
106				    "%s: Unrecognized date format", optarg);
107			}
108			break;
109#else
110			errx(EXIT_FAILURE,
111			    "-d not supported in the tool version");
112#endif
113		case 'f':
114			fmt = optarg;
115			break;
116		case 'j':		/* don't set time */
117			jflag = 1;
118			break;
119		case 'n':		/* don't set network */
120			nflag = 1;
121			break;
122		case 'r':		/* user specified seconds */
123			if (optarg[0] == '\0') {
124				errx(EXIT_FAILURE, "<empty>: Invalid number");
125			}
126			errno = 0;
127			val = strtoll(optarg, &buf, 0);
128			if (errno) {
129				err(EXIT_FAILURE, "%s", optarg);
130			}
131			if (optarg[0] == '\0' || *buf != '\0') {
132				errx(EXIT_FAILURE,
133				    "%s: Invalid number", optarg);
134			}
135			rflag = 1;
136			tval = (time_t)val;
137			break;
138		case 'u':		/* do everything in UTC */
139			(void)setenv("TZ", "UTC0", 1);
140			break;
141		default:
142			usage();
143		}
144	}
145	argc -= optind;
146	argv += optind;
147
148	if (!rflag && time(&tval) == -1)
149		err(EXIT_FAILURE, "time");
150
151
152	/* allow the operands in any order */
153	if (*argv && **argv == '+') {
154		format = *argv;
155		++argv;
156	} else
157		format = "+%a %b %e %H:%M:%S %Z %Y";
158
159	if (*argv) {
160		setthetime(*argv);
161		++argv;
162	} else if (fmt)
163		usage();
164
165	if (*argv && **argv == '+')
166		format = *argv;
167
168	if ((buf = malloc(bufsiz = 1024)) == NULL)
169		goto bad;
170
171	if ((tm = localtime(&tval)) == NULL)
172		err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
173
174	while (strftime(buf, bufsiz, format, tm) == 0)
175		if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
176			goto bad;
177
178	(void)printf("%s\n", buf + 1);
179	free(buf);
180	return 0;
181bad:
182	err(EXIT_FAILURE, "Cannot allocate format buffer");
183}
184
185static void
186badcanotime(const char *msg, const char *val, size_t where)
187{
188	warnx("%s in canonical time", msg);
189	warnx("%s", val);
190	warnx("%*s", (int)where + 1, "^");
191	usage();
192}
193
194#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
195
196static void
197setthetime(const char *p)
198{
199	struct timeval tv;
200	time_t new_time;
201	struct tm *lt;
202	const char *dot, *t, *op;
203	size_t len;
204	int yearset;
205
206	if ((lt = localtime(&tval)) == NULL)
207		err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
208
209	lt->tm_isdst = -1;			/* Divine correct DST */
210
211	if (fmt) {
212		t = strptime(p, fmt, lt);
213		if (t == NULL) {
214			warnx("Failed conversion of ``%s''"
215			    " using format ``%s''\n", p, fmt);
216		} else if (*t != '\0')
217			warnx("Ignoring %zu extraneous"
218				" characters in date string (%s)",
219				strlen(t), t);
220		goto setit;
221	}
222	for (t = p, dot = NULL; *t; ++t) {
223		if (*t == '.') {
224			if (dot == NULL) {
225				dot = t;
226			} else {
227				badcanotime("Unexpected dot", p, t - p);
228			}
229		} else if (!isdigit((unsigned char)*t)) {
230			badcanotime("Expected digit", p, t - p);
231		}
232	}
233
234
235	if (dot != NULL) {			/* .ss */
236		len = strlen(dot);
237		if (len > 3) {
238			badcanotime("Unexpected digit after seconds field",
239				    p, strlen(p) - 1);
240		} else if (len < 3) {
241			badcanotime("Expected digit in seconds field",
242				    p, strlen(p));
243		}
244		++dot;
245		lt->tm_sec = ATOI2(dot);
246		if (lt->tm_sec > 61)
247			badcanotime("Seconds out of range", p, strlen(p) - 1);
248	} else {
249		len = 0;
250		lt->tm_sec = 0;
251	}
252
253	op = p;
254	yearset = 0;
255	switch (strlen(p) - len) {
256	case 12:				/* cc */
257		lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
258		if (lt->tm_year < 0)
259			badcanotime("Year before 1900", op, p - op + 1);
260		yearset = 1;
261		/* FALLTHROUGH */
262	case 10:				/* yy */
263		if (yearset) {
264			lt->tm_year += ATOI2(p);
265		} else {
266			yearset = ATOI2(p);
267			if (yearset < 69)
268				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
269			else
270				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
271		}
272		/* FALLTHROUGH */
273	case 8:					/* mm */
274		lt->tm_mon = ATOI2(p);
275		if (lt->tm_mon > 12 || lt->tm_mon == 0)
276			badcanotime("Month out of range", op, p - op - 1);
277		--lt->tm_mon;			/* time struct is 0 - 11 */
278		/* FALLTHROUGH */
279	case 6:					/* dd */
280		lt->tm_mday = ATOI2(p);
281		switch (lt->tm_mon) {
282		case 0:
283		case 2:
284		case 4:
285		case 6:
286		case 7:
287		case 9:
288		case 11:
289			if (lt->tm_mday > 31 || lt->tm_mday == 0)
290				badcanotime("Day out of range (max 31)",
291					    op, p - op - 1);
292			break;
293		case 3:
294		case 5:
295		case 8:
296		case 10:
297			if (lt->tm_mday > 30 || lt->tm_mday == 0)
298				badcanotime("Day out of range (max 30)",
299					    op, p - op - 1);
300			break;
301		case 1:
302			if (isleap(lt->tm_year + TM_YEAR_BASE)) {
303				if (lt->tm_mday > 29 || lt->tm_mday == 0) {
304					badcanotime("Day out of range "
305						    "(max 29)",
306						    op, p - op - 1);
307				}
308			} else {
309				if (lt->tm_mday > 28 || lt->tm_mday == 0) {
310					badcanotime("Day out of range "
311						    "(max 28)",
312						    op, p - op - 1);
313				}
314			}
315			break;
316		default:
317			/*
318			 * If the month was given, it's already been
319			 * checked.  If a bad value came back from
320			 * localtime, something's badly broken.
321			 * (make this an assertion?)
322			 */
323			errx(EXIT_FAILURE, "localtime gave invalid month %d",
324			    lt->tm_mon);
325		}
326		/* FALLTHROUGH */
327	case 4:					/* hh */
328		lt->tm_hour = ATOI2(p);
329		if (lt->tm_hour > 23)
330			badcanotime("Hour out of range", op, p - op - 1);
331		/* FALLTHROUGH */
332	case 2:					/* mm */
333		lt->tm_min = ATOI2(p);
334		if (lt->tm_min > 59)
335			badcanotime("Minute out of range", op, p - op - 1);
336		break;
337	case 0:					/* was just .sss */
338		if (len != 0)
339			break;
340		/* FALLTHROUGH */
341	default:
342	    if (strlen(p) - len > 12) {
343		    badcanotime("Too many digits", p, 12);
344	    } else {
345		    badcanotime("Not enough digits", p, strlen(p) - len);
346	    }
347	}
348setit:
349	/* convert broken-down time to UTC clock time */
350	if ((new_time = mktime(lt)) == -1) {
351		/* Can this actually happen? */
352		err(EXIT_FAILURE, "mktime");
353	}
354
355	/* if jflag is set, don't actually change the time, just return */
356	if (jflag) {
357		tval = new_time;
358		return;
359	}
360
361	/* set the time */
362#ifndef HAVE_NBTOOL_CONFIG_H
363	struct utmpx utx;
364	memset(&utx, 0, sizeof(utx));
365	utx.ut_type = OLD_TIME;
366	(void)gettimeofday(&utx.ut_tv, NULL);
367	pututxline(&utx);
368
369	if (nflag || netsettime(new_time)) {
370		logwtmp("|", "date", "");
371		if (aflag) {
372			tv.tv_sec = new_time - tval;
373			tv.tv_usec = 0;
374			if (adjtime(&tv, NULL))
375				err(EXIT_FAILURE, "adjtime");
376		} else {
377			tval = new_time;
378			tv.tv_sec = tval;
379			tv.tv_usec = 0;
380			if (settimeofday(&tv, NULL))
381				err(EXIT_FAILURE, "settimeofday");
382		}
383		logwtmp("{", "date", "");
384	}
385	utx.ut_type = NEW_TIME;
386	(void)gettimeofday(&utx.ut_tv, NULL);
387	pututxline(&utx);
388
389	if ((p = getlogin()) == NULL)
390		p = "???";
391	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
392#else
393	errx(EXIT_FAILURE, "Can't set the time in the tools version");
394#endif
395}
396
397static void
398usage(void)
399{
400	(void)fprintf(stderr,
401	    "Usage: %s [-ajnu] [-d date] [-r seconds] [+format]",
402	    getprogname());
403	(void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
404	(void)fprintf(stderr,
405	    "       %s [-ajnu] -f input_format new_date [+format]\n",
406	    getprogname());
407	exit(EXIT_FAILURE);
408	/* NOTREACHED */
409}
410